import json
import os
import shutil
import subprocess
import sys
import tempfile
import time
import unittest
from unittest import mock

import shellmcp

HERE = os.path.dirname(os.path.abspath(__file__))


class Run(unittest.TestCase):
    def test_exit_code_and_combined_output(self):
        self.assertEqual(shellmcp.run("echo hi; echo oops >&2; exit 3", HERE),
                         "exit code 3\nhi\noops\n")

    def test_long_output_keeps_head_and_tail(self):
        out = shellmcp.run("printf 'a%.0s' $(seq 100); printf 'b%.0s' $(seq 100)", HERE, limit=20)
        self.assertEqual(out, "exit code 0\naaaaaaaaaa\n[... 180 characters cut ...]\nbbbbbbbbbb")

    def test_timeout_kills_the_whole_group(self):
        start = time.monotonic()
        out = shellmcp.run("sleep 30 & sleep 30", HERE, timeout=1)
        self.assertLess(time.monotonic() - start, 5)
        self.assertEqual(out, "timed out after 1 s, killed\n")

    def test_no_stdin_and_no_pager(self):
        self.assertEqual(shellmcp.run("cat; echo $PAGER", HERE), "exit code 0\ncat\n")

@unittest.skipUnless(shutil.which("bwrap"), "needs bwrap")
class Sandbox(unittest.TestCase):
    def test_readonly_cannot_write_and_hides_paths(self):
        with tempfile.TemporaryDirectory(dir=HERE) as d:  # not /tmp: the sandbox replaces /tmp
            os.mkdir(os.path.join(d, "secret"))
            open(os.path.join(d, "secret", "key"), "w").close()
            prefix = shellmcp.sandbox(d, [os.path.join(d, "secret")])
            out = shellmcp.run("touch new; ls secret; echo > /tmp/x && echo tmp-ok", d,
                               prefix=prefix)
            self.assertIn("Read-only file system", out)
            self.assertNotIn("key", out)
            self.assertIn("tmp-ok", out)
            self.assertFalse(os.path.exists(os.path.join(d, "new")))